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Construction Glossary

Gross Square Footage (GSF)

Unusable square footage within a building space. For example, corridors, inside walls, custodian closets, utility spaces, etc.

What Is Gross Square Footage (GSF)?

Gross Square Footage (GSF) is the total floor area of a building measured from the exterior walls, including all usable and non-usable spaces. It encompasses areas such as walls, columns, and structural components, and is used for various purposes including space planning, leasing, and valuation. GSF provides a comprehensive measure of the building’s overall size.

Example

Total area of a building including all spaces.